A timeline must contain the terms CE/BCE explains the reasons events happened puts events in context with one another identifies events and the effects of those events on a place

The answer is "Must contain the terms CE/BCE".

Explanation:

The timeline is a sequentially-ordered view of events. It's generally a graphic design that displays a long bar labeled in dates that are in conjunction with this and often historical events. It includes the "CE/BCE", in which CE implies the traditional era, while BCE implies the current era, and the incorrect choices can be defined as follows:

labor leaders and organizations had the power to demand it.

explanation:

workers got a five-day workweek because the bcea protects and respect the rights of the employees. labor leaders and other groups demanded it.